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        <h2 id="ConditionalXXX注解族"><a href="#ConditionalXXX注解族" class="headerlink" title="@ConditionalXXX注解族"></a>@ConditionalXXX注解族</h2><h3 id="ConditionalOnProperty"><a href="#ConditionalOnProperty" class="headerlink" title="@ConditionalOnProperty"></a>@ConditionalOnProperty</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Retention(RetentionPolicy.RUNTIME)</span></span><br><span class="line"><span class="meta">@Target(&#123; ElementType.TYPE, ElementType.METHOD &#125;)</span></span><br><span class="line"><span class="meta">@Documented</span></span><br><span class="line"><span class="meta">@Conditional(OnPropertyCondition.class)</span></span><br><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> ConditionalOnProperty &#123;</span><br><span class="line"></span><br><span class="line">   <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * Alias for &#123;<span class="doctag">@link</span> #name()&#125;.</span></span><br><span class="line"><span class="comment">    * <span class="doctag">@return</span> the names</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">   String[] value() <span class="keyword">default</span> &#123;&#125;;</span><br><span class="line"></span><br><span class="line">   <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * A prefix that should be applied to each property. The prefix automatically ends</span></span><br><span class="line"><span class="comment">    * with a dot if not specified. A valid prefix is defined by one or more words</span></span><br><span class="line"><span class="comment">    * separated with dots (e.g. &#123;<span class="doctag">@code</span> &quot;acme.system.feature&quot;&#125;).</span></span><br><span class="line"><span class="comment">    * <span class="doctag">@return</span> the prefix</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">   String <span class="title function_">prefix</span><span class="params">()</span> <span class="keyword">default</span> <span class="string">&quot;&quot;</span>;</span><br><span class="line"></span><br><span class="line">   <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * The name of the properties to test. If a prefix has been defined, it is applied to</span></span><br><span class="line"><span class="comment">    * compute the full key of each property. For instance if the prefix is</span></span><br><span class="line"><span class="comment">    * &#123;<span class="doctag">@code</span> app.config&#125; and one value is &#123;<span class="doctag">@code</span> my-value&#125;, the full key would be</span></span><br><span class="line"><span class="comment">    * &#123;<span class="doctag">@code</span> app.config.my-value&#125;</span></span><br><span class="line"><span class="comment">    * &lt;p&gt;</span></span><br><span class="line"><span class="comment">    * Use the dashed notation to specify each property, that is all lower case with a &quot;-&quot;</span></span><br><span class="line"><span class="comment">    * to separate words (e.g. &#123;<span class="doctag">@code</span> my-long-property&#125;).</span></span><br><span class="line"><span class="comment">    * <span class="doctag">@return</span> the names</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">   String[] name() <span class="keyword">default</span> &#123;&#125;;</span><br><span class="line"></span><br><span class="line">   <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * The string representation of the expected value for the properties. If not</span></span><br><span class="line"><span class="comment">    * specified, the property must &lt;strong&gt;not&lt;/strong&gt; be equal to &#123;<span class="doctag">@code</span> false&#125;.</span></span><br><span class="line"><span class="comment">    * <span class="doctag">@return</span> the expected value</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">   String <span class="title function_">havingValue</span><span class="params">()</span> <span class="keyword">default</span> <span class="string">&quot;&quot;</span>;</span><br><span class="line"></span><br><span class="line">   <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * Specify if the condition should match if the property is not set. Defaults to</span></span><br><span class="line"><span class="comment">    * &#123;<span class="doctag">@code</span> false&#125;.</span></span><br><span class="line"><span class="comment">    * <span class="doctag">@return</span> if should match if the property is missing</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">   <span class="type">boolean</span> <span class="title function_">matchIfMissing</span><span class="params">()</span> <span class="keyword">default</span> <span class="literal">false</span>;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p>@ConditionalOnClass<br>@ConditionalOnBean<br>@ConditionalOnMissingBean</p>
<p>@ConditionalOnSingleCandidate</p>
<p><a target="_blank" rel="noopener" href="https://spring.hhui.top/spring-blog/2018/10/19/181019-SpringBoot%E5%9F%BA%E7%A1%80%E7%AF%87Bean%E4%B9%8B%E6%9D%A1%E4%BB%B6%E6%B3%A8%E5%85%A5-ConditionalOnProperty/">一篇很齐全的博客</a></p>

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